I think there is a type of person people associate with musicians (especially rappers) and fascinate about. And when a person doesn't live up to those standards, they're deemed different. And when one thinks that artist is attractive and, thus won't be a part of their fantasy, they see them in a negative manner.
For a 23 year old, he seems like a regular guy (not a thug), and likes being a young man who hasn't been tainted by money and fame. And he's quite attractive. And for that, he won't fit into many of people's stereotypes. So they think he's "gay'. Which, ironically, they mean as a negative thing.